package util;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * 数据库连接工具类
 */
public class DBUtil {
    private  DBUtil(){

    }
    private  static MysqlDataSource dataSource;
    private  static volatile Connection connection;

    private static MysqlDataSource getDataSource(){
        if(dataSource==null){
            synchronized (DBUtil.class){
                if(dataSource==null){
                    dataSource=new MysqlDataSource();
                    dataSource.setUrl("jdbc:mysql://127.0.0.1:3306/orderdb2022?characterEncoding=utf8&useSSl=true");
                    dataSource.setUser("root");
                    dataSource.setPassword("12345678");
                }
            }
        }
        return dataSource;
    }
    //1.提供connection对象
    public static Connection getConnection() throws SQLException {
        MysqlDataSource dataSource=getDataSource();
        return dataSource.getConnection();
    }
    //2.关闭资源的方法
    public static void close(ResultSet set, PreparedStatement statement,Connection connection) throws SQLException {
        if(set!=null)set.close();
        if(statement!=null) statement.close();
        if(connection!=null) connection.close();
    }
}
